Changes from 1.21.99.6 to 2.0.99
- allow IGNORE_OSVERSION on all oses
- improve dealing with symlinks to directories and upgrades
Changes from 1.21.99.5 to 1.21.99.6
Changes from 1.21.99.6 to 1.21.99.6
- ignore OSVERSION if set but ABI is not set